Literary references to zaffre often emphasize its role as a striking pigment that imbues artworks and descriptions with a deep, vibrant blue. In several texts, zaffre is equated with cobalt blue—a hue celebrated for its luminosity and intensity. For instance, one author even credits its first practical use to being synonymous with cobalt blue, highlighting its transformative visual power in art and glassmaking [1]. Moreover, some writers note that only a tiny amount of this pigment is sufficient to impart a full, rich blue tint—so intense that a single grain can color many times its weight in glass [2]. There are also passages where the term appears in discussions of subtle shade modifications, suggesting that zaffre’s distinctive blue has long been prized for its ability to alter and enhance tonal qualities in creative works [3].